#include "validation.h"
#include <vector>

struct P { __int128 x,y; };

__int128 dist_sq(P a, P b) {
    return (a.x - b.x)*(a.x - b.x) + (a.y-b.y)*(a.y-b.y);
}

int main(int argc, char **argv) {
	// Set up the input and answer streams.
	std::ifstream in(argv[1]);
	OutputValidator v(argc, argv);

	int n;
	in >> n;
	vector<P> ps(n);
	for(auto&p : ps) {
		long long a, b;
		in >> a >> b;
		p.x = a;
		p.y = b;
	}

	P p, q;

	p.x = v.read_long_long(-1e18, 1e18);
	v.space();
	p.y = v.read_long_long(-1e18, 1e18);
	v.newline();
	q.x = v.read_long_long(-1e18, 1e18);
	v.space();
	q.y = v.read_long_long(-1e18, 1e18);
	v.newline();

	v.check(p.x!=q.x || p.y!=q.y, "Output points should be different!");

	int left=0, same=0, right=0;
	for(auto r : ps){
		auto d1 = dist_sq(p, r);
        auto d2 = dist_sq(q, r);
		if(d1 == d2) ++same;
		if(d1 < d2) ++left;
		if(d2 < d1) ++right;
	}
    v.check(same <= 1, "Wanted at most 1 point equally far from both lifeguards.");
	v.check(left==right, "Wanted ", n/2, " points for each lifeguard but found ", left, " and ", right, "!");
}